what would be the best heads
I wouldn't think there is anyone that can tell you what size combustion chamber to purchase without knowing the piston brand or the volume of the piston. (Flattop-5cc dished-18cc). While the heads are off measure the distance from the top of the block to the top of the piston. Write it down and keep it handy because you will need it to figure your quench, head chamber volume, and compression ratio.