[Chris1529]

per the NHRA classification guide, the shipping weight of your car is 2968#.

for the 347/450, IHRA rates it at 430HP.

2968/430 = 6.90 lb/hp. which makes it a B/CM (6.5-6.99 lb/hp)
your race weight for B is 6.5x430+170( for driver) = 2965#
you could run A/CM or C/CM by subtracting or adding 215#. I doubt you could get it light enough to run A though.

I am not sure how much IHRA rates the 340HP 302.
assuming it is 340, 2968/340 = 8.72 which is F/CM (8.5-8.99) it may only be rated at 320 though. I don't have my lates drag review with me.

You can see the rulebook, class indexes, etc. on IHRA.com