[Pampered-Z]

Without doing allot of checking, my first "guess" would be you shouldn't need to change cams, they probably aren't that different between carb and TBI. Nothing that would cause any real issues.

What are you using the engine for? What you may need to look into is the CC of the heads. If the old heads were big chambers and the new ones small chamber you might want to verify you're not pushing the compression ratio above regular grade gas, or even above pump gas?

When you pull the engines apart check the piston style, may need to check piston to valve clearance due to piston design? Probably not an issue, but you may want to check if one engine had the 4-valve reiefs, and the other 2-releif or flattops?

Like others said, check pushrod lenght, probably standard SBC flat tapped PRs, Also check the holes for the intake aligne, that might be the issue or at least your need to purchase an intake that matches up. Also double check all the fittings sizes and mounting holes are in the same locations so that all the brackets bolt up correctly.

Keep us posted, sounds like a cool build.

JB