Slowly but surely, I'm getting closer to swapping my 454 into my rig ('75). My question is concerning clearance for the distributor at the firewall and the driver side valve cover under the brake booster. I plan on running an HEI distributor, will I have to indent the firewall to create clearance? I'm using M/T finned valve covers which appear to be taller than stock, will the driver's side one fit under the master cylinder booster? I know big blocks came in some of the regular pick up truck bodies so I imagine clearance shouldn't be an issue, but I just want to make sure so I can plan ahead. What about a 1" body lift? But then I have to worry about clearance for the fan inside the shroud. Thanks! It's not what you buy, it's what you build!