1. I would like to see a pic of the motor mount cross member in place showing the whole motor. Not just a tight shot of it.
2. If you are talking about removing the factory tubular cross member. NO! Do you have a reason?
3. Does the HEI distributor cap fit on and off OK with room for plug wires to exit?
4. What is a power booster? Brake booster? Original Bendix Hydrovac.
5. Does the motor work in that position as far as drive shafts? Better make sure they fit.
6. Will fan blade hit anything?
7. Set radiator support temporarily in place.
8. If you are going to get power disc brakes, IF you can find a kit or DIY, you won't be using that big old booster. You will use a new modern booster. That booster you have is worth some money.
9. Set carb mounting surface to zero level with truck on level ground. The Chevy crankshaft is at 4 deg down angle to create the proper pinion angle. So check top of tranny to see if it is at 4 deg down.
10. Yes it does make sense to do a hydraulic clutch in your case. No pedal swap. Truck designed for Hydraulic Clutch. There are several easy to install kits for Chevy V8 bell housings.
11. So that master cylinder reservoir on you firewall was plumbed to the hydraulic clutch slave on the passenger side of the V6? How is the Hydrovac plumbed and how is the master cylinder on it operated? you may be able to use and original dual master cylinder on fire wall until power disc is figured out Later. I would have to see up under dash to see your pedal push rods. In a non hydrovac, there are two push rods side by side. One on the brake pedal and one on the clutch pedal. They went into the firewall dual MC.

You have much more mocking up to do while motor is in it's proposed place, before you start cutting anything. The idea is to NOT cut anything.
So far you are doing a real good job. Put the motor mounts on and the crossmember on and leave them on. Show pics of that. You don't ahve to cut the tube yet, just leave the ends off if you want, but be sure ends will bolt to frame on a flat spot. Put exhauts manifolds on with a few bolts.
Attachments
Hydraulic clutch.jpg (35.7 KB, 30 downloads)


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