408 build

If I was you I'd find a good running engine.
My plan for my cuda is to eventually build a 408 even though I'm not the hugest fan of the design I feel if you want 400 plus cid go big block but the smaller engine bay of the early A Bodies and my budget since I got a good running 318, 408 is what's in the cards. I already picked up a decent cam intake and carb off my cousin cheap gonna run it like that with duals for now. Then replace the top end in separate projects of the next couple of years. Headers and fuel injection will be on top of the list then air gap intake and eddy heads down the road. Down the road after that point I'll build a 408 bottom end and swap the 318 top end on to it. Down the road from there always can have the top end fully ported and bigger cam. And if that's not enough there's always Nos :)