im in the process of this on a HO motor in my 67. In my scenario i had to drop the engine a little (mounts were too high in there anyway) as the bonnet was touching the top of the supercharger with the bonnet level and wanted somemore clearance. This caused an issue down below as now the alternator is down the bottom and was fouling on the radius rod area.. rather than cut or concave that area i modified the alternator bracket to swing the alternator up a bit thus leaving the belt the correct length still and the tensioner within range. I have TCP shock tower braces so this aided in fitment as they arent soo bulky as te stock ones. Ill be putting the full TCP shock tower brace kit on.. the monte carlo bar will need slight modification to go over the A/c and the s/c itself but only slightly which TCP instructions already state a few options to clear accessories in some applications.
My engine is originally a factory EFI but arrived with my car as a carb (holley 670 carb and edelbrock intake and heddman headers). Ive since changed this to a HOlley Systemax efi intake with TFS1 cam and the paxton with stock pulley which i think is only 8psi boost. one day ill change the heads but until then im just changing to stiffer springs as recommended by both TFS and Paxton.
after reading the responses above, im looking forward to driving it when its finished to see how different it is to N/A.. I wont be driving aggressively anyway until i know she will hold up or when i do somemore appropriate upgrades..
always been a N/A guy and now ive converted to the dark side :D
heres some pics in the bay.
good luck with what you decide