340 x-block vs. 410 stroker ?

Also I will be ordering a front fiberglass bumper with the rear fiberglass bumper that I already do have. And I will be keeping my manual steering. I'm sure one of my projects this summer will be completely lightning that hood though. I do think I'll under spring load the hinges and use a prop. I could really get a ton more weight or the hood if I did that. Actually one of my goals is to see if I can get the hood anywhere close to fiberglass weight.