SD build
The factory crank will be fine for what your doing. But, if you were going to buy a crank then I would go with a forged 4.250 crank which is slightly longer than your 4.210 factory crank. The Eagle of other brand complete assemblies are a pretty good deal, but I would stick with your crank, get some H beam rods, and spend the extra money on a custom piston to get your compression up some, and a roller cam. You don't have machine the block for roller lifters. In my opinion, yes, the extra performance and reliability is worth the cost to go with a roller camshaft versus a flat tappet.
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs
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