The color you want (if you spray bomb it) is "Details:Insert Gray" By our sponsor,Ground Up.HOWEVER,IMO it's a tad too dark,and I've had great success with Plastikote's Rebuilders Cast Finish Grey.A few other TC guys have used the Plastikote and was impressed with the results.
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1970 Chevelle SS396/M21/4.10
My 70 SS396
Engine pic
1970 Chevelle SS454
My 70 SS454
1968 Oldsmobile Cutlass convertible
1982 Oldsmobile Cutlass 350 Olds,TH350(daily driver)
Chris Corwel,TC Member 785