Ahhh the Clevo, my favorate.....
Since you are using the 302 rods, (which BTW, is a very good move), it will rev very nicely.
My preference is to use a single plane manifold like a weiand or Holley street dominator, as the Performer dies at high revs.
The single plane gives little away to the Performer at low revs.
Block off the heat passage which travels through the manifold too.
I wouldn't go much bigger than a Camtech stage 3 with an auto and ask Camtech what stall converter they recomend, (3500rpm sounds rather high to me and will likely be a pig on the road).
I also prefer solid lifters to hydraulic.
10:1 CR should be fine and dandy, but you must use PULP or Optimax, etc.
With PULP fuels in mind you will need good exhaust valves and hardened exhaust seats.
Have bronze guides fitted too.
650 Holley is a good choice, but use a double pumper if you want decent top end power.
Fit a decent sump as they suffer badly from oil surge with the standard unit. I'd also fit a stronger oil pump drive and a decent roller chain.
Keep us posted.