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I'm getting ready to finally start the engine in my 67 but I'm unsure of what spark plugs I should use. It is a 350 block with 64cc heads (#3932442) which I think are from 1966. I am using a Comp Cam, L2256 Pistons, Edlebrock Air Gap manifold and a MSD ignition. The machine shop reccomended AC #R45TS plugs. These are the 5/8 in plugs and I thought it would use the 13/16 in. Any suggestions? Thanks
 

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the numbers might have changed... i dunno. but the numbers i know are R45S for the 13/16 and R45TS for the 5/8... both are projected tip plugs
 

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I think the 441 heads are newer than 1966. They use a taper plug 5/8. To make sure they don't take a washer type look at the plug surface on the head if it's flat they take a washer style 13/16 but if there is a taper then it's 5/8's.
 
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