[dsraven]

That's a lot of angle for the engine. Usually somewhere around the 3 deg is what guys use. If going carbed the intake mount surface for the carb will be level with the engine at 3 deg down at the rear.
S10 v8 swap mounts would place the engine correct for installing the v8 in an s10 bidy, not necessarily in an old truck. If you have access to an s10 you could figure out where the firewall would be for the s10 and compare to your truck body or go to the GM outfitters site bodybuilder manuals and choose the s/t series for some fun times looking for that drawing.