The best stroker 408-416-426-435 combination in stock 68 340 block

There's really only 4 things that are important:
1. The engine has to make the power physics says is needed to accelerate the weight to the speed you want it to go.
2. The rest of the driveline and suspension has to be compromised to deliver that power in a manner consistent with the type of acceleration needed.
3. The owner has to have the cash to make #1 and 2 happen.
4. Someone has to make sure everything works properly. Even matched parts can be screwed up on install and not work as expected.