Where to go from here?

Guys - Have been working on restoring a 70 swinger which came originally with a slant 6. I have been collecting parts and geting ready to put it all together, but would ask if any of you could offer advice on how to proceed from where I am at. I received a 68 340 block which is 30 over with a clean bore, included a forged crank and a set of bare J heads as well as a bellhousing, flywheel and a 4 speed. I have a set of TRW pistons which are 30 over, formerly 13 to 1 but cut down to about 11.25. I am looking for thoughts on should I get these cut a bit more? I would like to use pump gas on this. The J heads do have hardened seats installed, but no valves. I did pick up a set of adjustable rocker arms with shafts, etc. At this point I need to find a set of connecting rods and make a decision on the pistons and what to do for valves, cam etc. This will be a driver, any assistance would be appreciated.