uhhhhhhh if it'* a stroker motor... they aren't stock internals
I said Externals. Heads, Intake, Block and exhaust. Basically I'm saying the stock stuff would work. Maybe not well, but they would work. What are valve\cam specs on a 4.3 liter GM ?
One thing to note. Most of the stroker kits I have seen put the ring lands down into the wrist pins. Works great for a while, but rings don't like to be unsupported. Also,
most strokers put extreme side loads on the pistons. I wonder if this one does ?