You mean 345 30's, right. 345/70's are 37" tall. :rofl: That's donk territory. I'm guessing you have a Dominator. 3 circuit probably. Any idea on cam specs? I'm sure the specs look crazy (min 740 lift and 270 deg duration). But on a 598, the numbers are actually nominal. Does the dyno sheet show power levels below 4000 rpm?

Options are TH400 and 4L80E. By the way, I think Shafiroff had DSE build him a 69 Camaro. So I highly recommend that you pick his brain on the subject. If you get that chance, ask about available torque between 2500 and 4000 rpm. I think you will be spending a lot of time in that rpm range, so finding out power levels between 2500 and 4000 (even if they are guesstimates) is key.

On the street, won't tire friction be weak link in 1, 2, and maybe 3rd gear. The torque of a big block can only be used at the strip, or on the street over 100mph.

hmmm
 

with all that tourque id build a driveline that gave me no headaches instead of worrying about the last 2%... my best bet would be a 4l80e with shrifter.. and a 9 inch (possibly with 12 bolt ring and pinion if you are really anal about efficiency)

also id get the regulkar 745 hp or 705 hp EC (extended cruicing) option from shafiroff instead of the SS that you are talking about... i mean fi you intend to run it 90% on the street then why get a Saturday-night Special motor.. besides you can always add a shot of nitrous in second and two in third if you feel things are a bit slow with a 750 Hp big block...

oh yeah, and you are NEVER going to get a decent launch on 30 profile tires... so be sure to get brakes that accomodate a 15 inch rim in the back...

and 3.73 might not be the best choice with an OD tranny..

At that power level... you better believe there is.