im boring out a 5.3 liter block to a 5.7. going with stock 5.7 crank rods and piston with a tr224 cam. my question is would i need a double roller timing chain and i also thought about a ls6 ported and polished oil pump?

 

A dual roller is not needed for your setup, A Ls2 chain would be adiquite. Also The pump is always a good idea.