Dumb question?

[Ziegelsteinfaust]

Not with out massive work, and even then it is likely not be possible.

Piston pin locations or height are to different as is the valve lay out.

It could work if you have a tall deck block where you could mix and match to find a combo. With SB2 style heads which are about as close to porcupine bbc heads as I am aware.

Even with the short rods the 400 cam with. Much less 5.7's the pin is nearly in the oil control ring. Which with 6's i think it behind them.

DSS pistons makes custom pistons at a reasonable price.