You're missing only two things from achieving your goal: Flow and compression.

You have already spent $$ on the block, crank and rods, replace the pistons with some that are same or less weight than you have now so balancing is easy if the weights are different. compression height should put piston at or near zero deck.

Purchase those pistons AFTER you buy a new set of smallblock Sidewinder heads. Get the pistons so you have roughly 10.5:1 compression.

Everything else remains the same.

R.