Diamond has shelf pistons for that combo,
The mains on the crank need to be cut to low deck size, and the counter weight may need to be turned down.
At the price to have that done you could probably just about get the 440 source 3.75 stroke crank for low deck at $750.
For that fact the money you spend on a stock crank, new bolts/re size rods, pistons/rings and balance. Just like Andy said.
The entire kit from 440 source is like 2k and it's all brand new not 40+years old