428 pistons are going to give you 2.7:1 compression, which will be good as your cylinder walls will be paper thin if not poked through.

FE Series Engine Specification Chart

Compression Ratio Calculator

Someone mentioned 361 pistons as the answer earlier. Other than that, no soap for higher CR for the 360. I do not have the info on the 361 slugs so not sure that works.

On Edit:

Silvolite lists a 361 piston with a 1.902 compression height. Gotta run, can do the numbers on that right now...

http://www.kb-silvolite.com/silv-o-l...tails&S_id=146