I am running a 360 block, but changing crank and rods to 390 parts for the extra go. And heres my head specs;

This set of "FE" cast iron heads that have been professionally rebuilt with stainless 2.090" Intake and 1.650" exhaust valves with swirl polished and undercut stems to increase flow

These 69cc heads are complete and include:

These heads have been vatted, magnafluxed checked for cracks, glassbeaded/steelabrated, tap bolt holes, new guides installed, both intake and head surface have been machined to ensure a good sealing surface
Install hardened exhaust seats for use with leaded or unleaded fuel
Blend bowls for 2.090"Int/1.650"Exh stainless swirl polished "Cobra Jet" size valves
Cut seats for 2.090" and 1.650" valves
Drill and install all new guides
3-angle valve job
Set up 1.440" high performance springs to handle up to .600" valve lift
These heads have the small intake ports
New Parts:

"Cobra Jet size" 2.090"Int/1.650"Exh stainless swirl polished valves with undercut stems to increase flow
New valve guides machined to clear high lift cam
High Performance 1.440" valve springs