Engine builder questions

John..you are going to have to find a piston with a 1.66 compression height...plus or minus...

dont know much about 273s, using a stock piston is going to be pretty hard to do...not only will you have to cut the top of the piston...but the skirts will probably need to cut to clear the counter balances on the crankshaft.

a set of custom pistons might be the easiest way to go...certainly will get a piston that will properly fit and along with valve notches...and get a light weight piston ....

you might be able to cut the rods journals down to fit a sbc..and use a shorter rod...that might help with the piston dome cutting but the skirts are going to get closer to the crank.....