318 with 360 heads and compcam build help

OP wants to get the ball rolling, and is planning on using the 360 heads.

So, start by bringing them to a machine shop for an assessment and estimate.
Get them done and ready to go.
(Depending on condition, missing parts, needed upgrades, and machine shop rates in your area, this could range from $300-$1000)

They can be used for essentially any build that fits what’s been described as the intended use.