When the 455 is installed in my 66 442 the brake booster is about a 1/4" off the valve cover, is this correct or should have i gotten a mini booster like i put in my SS. I put a manual brake cylinder and although it looks good I was wondering if I just should go with the stock vacuum booster?
Bum

 

That should be fine. If all else fails you can get the notched valve covers.

 

you'll have to excuse my ignorance , I am a chevy guy who couldn't resist buying my beautiful 1966 442 , I have never heard of "notched Valve covers, are they stock or after market?
thanks
Bum

 

Olds put factory clearance notches in the valve covers of big block A-body cars. This was done to simplify removal of the covers with the engine in place, but it is not mandatory.