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Welcome to the Forum !!!!

Heres a few shots of the frame mounts that Captainfab is speaking of. These are stock big block frame mounts from 1968-1971 Chevy and GMC trucks. They are a bolt in and move the engine forward enough so your not banging up the firewall. You will need to trim the upper edge of the frame back a little, they did this on the 68-71 frames also from the factory. You can see what I did in the close ups of the mount. You will also need to move your trans crossmember, I just bought one on-line aftermarket and redrilled the holes. Very easy swap, these mounts also give you more clearance for stock exhaust manifolds. I ran Sanderson headers here with no trimming or clearance issues.