68’ barracuda tear down and rebuild suspension Q’s

Chryslerkid said

I am planning on rebuilding a 350-400hp 318 meant for street driving and cruising on the weekends.

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If you really want that much power from a 318, for a street cruiser; I highly recommend aluminum hi-flow heads, and max the cylinder pressure as high as you can affordably go, to around 185 or a bit more. This will allow you to run a much more streetable cam, like a 220 to 228 @.050. I'm thinking Magnums. And I'd try 87E10
Or just put a small stroker crank in it,like a 3.58 or a 3.79.. The 3.58 would make getting a zero-deck easy. It's almost too easy
Make up any performance shortfall with stall and gears.