375-400hp 360?

Click the link in my sit at the bottom of the post.

Otherwise, a simple way of doing this is to copy the create engine from years past. The 360/360 used the 284/.484 cam (or your Hyd. cam @ around [email protected]) in a 9.0-1 short block (You can use the KB-107 slugs) topped with the then OE head (308/576 IIRC) w/2.02/1.60 valves, M1 single plane (use the Edelbrock rpm instead for better torque and no Hp loss worth mentioning if that even happens!)
750 carb & 1-3/4 headers. (TTI would be good!)
If you have any money to I nvest after the basic work above is done, spend it in the heads with porting or Edelbrock heads. But that blows your budget as listed with porting the heads.