The Stovebolt Site Forums The Shop Area Paint and Body Shop Cowl repair help

Hello all,
I am not much of a forum posting person but am in need of some serious help. So first off, I have a 1948 Chevy one ton and someone before me, did a terrible hack job so called restoration. What they really did was half repairs and paint.
So I have to replace the floor mount braces, rockers, inner cowl, and outer cowl, lower pillar by the hinge, and a section of the floor from the toe board half way through the battery box. There is other stuff, but this is what I am currently working on.
The issue; I have the floor repair cut and clamped in. I am fitting in the inner cowl panel where the heater box attaches all the way to the floor. I bought replacements from Jim Carter truck parts, I believe they have them manufactured for them. When I have that clamped in and try to fit the inner cowl arc piece that fits to the outer cowl, it seems to have a completely different radius at the bottom. It leaves a gap 3/8-1/2”. The arc is something the other person had put in. I don’t know where it came from, the bottom does not have the holes to attach to the end of the rocker. Has anyone had the same experience or have any insight on fitting these?
Thank you

Check out the forms I think klhansen has done his recently if you click on his pictures and look for some of the posts you will find some of the problems that they run into as the parts are not perfect and have to be altered to fit .

Yes, those inner cowl panels don't quite match the replacement floors or the inner-to-outer cowl panels, but can be modified to fit. It'll take some hammering and probably a little heat to get the job done. Click on this link and scroll left to see the photos of the work I did in that area.
I bought the shorter inner cowl panels as well, which fit better, but I decided not to use them (didn't want an additional weld joint), and made the ones I got from Jim Carter work.
If you have more questions (and I'm sure you will) feel free to ask. You might also post some pics of where you are, so we can get a better handle and possibly help out more.

The holes on the rocker panel are only needed on the driver's side, although both of the replacement rockers I got had holes in front. Don't worry about the lack of them on the passenger side cowl inner-to-outer panel.

Here's another post of mine with pics on the subject. Link

Here's the thread where I asked the collective of knowledgeable guys basically the same question you did. Link

Here is the start of progress posts I made in the "What did you get done on your bolt today" on that area. Scroll forward in that thread there for more info. I should really put those in the Project Journal forum so they're not so hard to track down.

Thanks,
I can see from the pics it seems to be a common issue. There are enough threads on it as I followed your links, it’s like going down a rabbit hole. Ha ha
I guess I am in for some fabricating.

That's true.
Good luck and be sure to holler if you run into a snag. Welcome to the rabbit hole.