The good thing is that everything interchanges. If you swap the rockers, change them all so the lift stays even. Some of the blocks were set up for hydraulic lifters, but the head can't tell the difference.
Find an 848 head if you can, they are higher compression. The only difference in stock cams is the vette used the 261 cam. You can buy a M4F from Patricks, which is close to the same grind. We used to call this a 3/4 race cam.
