My version of a factory parts build 318

Dan the man said

The 360 heads will only hurt the power unless the builder is willing to use different pistons to raise the compression.

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Your build is fine but do what you can to get the compression back and run some 340/360 castings. Port cross section and flow is more important than a point of compression.

I‘d rather have compression and the 340/360 heads but if I can’t get both I’m taking the 340/360 heads every day of the week.

I’d toss those other castings in the cess pool and cover them up.