your best bet is put the cab on along with the inner fenders and radiator support and try it.
Did you bolt on the front cross-member from the vette, or bolt it in? You will need to measure the front axle to firewall for clearance. If memory serves me correctly this is approximately 18.25" back from the front axle centerline.
After you get it mounted, you may be making headers
Dave, The Vette front cross-member supports the suspension, steering, front mono-spring, shocks, anti-sway bar and the engine. It is held to the vette front stub by 4 bolts.
