Reply to "Carb Spacer Question"

The '72 motor has a spread bore Autolite carb without egr, its a pretty good intake system as it stands. The carb flows about 700 to 750 cfm.

Because of the 4 hole/spread bore design of the intake manifold there are no matching 4 hole spacers available, and an open spacer just wouldn't be a good match. In all the years I've been around Clevos I've never seen anyone use a spacer on the factory spread bore intake manifolds.

The best way to wake that motor up while keeping the stock looks shall be to replace the heads with the 1970 or 1971 closed chamber heads, the 1971 head shall bump the compression ratio up from 8.8:1 to 9.7:1, the 1970 head shall bump it further to 10.0:1. Replace the factory exhaust system with the later model GTS exhaust system. Finally install a hotter camshaft. With the right camshaft you can hit 400 bhp with just those mods (and some porting/valve seat work). Of course, you'll want to install a good breakerless distributor too if the motor still has its breaker point ignition.

Be warned, if your motor has the oem Ford valves in the heads, or a 37 year old balancer snugged on the end of the crankshaft, it is a ticking time bomb.