I'm finishing putting my oldest son's 306 in this week and he is in much the same predicament you are. We agreed to build the bottom end to be as tough as he could afford with plans to add more equipment later. Basically it's like yours, .030 over forged pistons, 9.5:1 comp. ratio. Crank, flywheel, piston/rod assemblies balanced to +/- .5 gram. F303 cam (this was his idea, I hope it works) The rods are stock, resized, beams polished, and resized with ARP's.
For now, the stock heads got a pocket port job and all ports were massaged and port matched as well as polishing all of the runners, from the intake down. BBK long tubes with Flowmaster American Thunder pipes and mufflage. He already put 3:55's in it last year.
With any luck, the bottom end will serve him well with the rest of the mods he plans as money appears (intake, 24# injectors, 65mm TB and some Trick flow heads)
My philosophy is to add one part at a time to fully evaluate the improvement that part makes before adding the next piece.
I don't know if you are going down the right road but at least you know there's someone else out here headed the same way, hope it works.
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