Join Date: Nov 1999
Location: colorado springs co
I had the same problem 2yr back, on my 73 nova (no ac, pass side alt). you can buy mr gasket universal alt crome brackets for 10.00 at most part stores. But who wants that junk, I wanted to keep the stock brackes so i had to extent the bolt hole to the end of the bracket 1in, (use power tools it took forever with a hacksaw) now go buy studs 1 large and one small and about5 small washers to shim under the bracket for support(i needed to). also be sure to buy studs for the carb, (I cracked and striped my outer bolts due to alum being much much weaker than steel torque wrench!!) also be sure to keep your old manafold around incase of they worp/crack strip out. Keep your old cast iron thermostat cover, they will never warp or crack ( never use crome mr gaskets I have seen them rupture) since you already gotem its cheep ins.
There is also 1 bolt on performers (dr side 3rd back That is hard to tighten, the bolt it upaginst the intake runner, i had to buy a snap on cause its the ony boxed wrench that would slip down on the bolt enough to tighten it.
When your done check for leaks with starting fluid when done(intake leaks will ruin your block, pistons, and foul your plugs in a off set pattern (keeps fouling 2 inner spark plugs one side, and 2 outer on the other)
i hope my info helps,
chevy s rule