The Mahle VC gasket is the last one I used, and is the thicker of the three. It may not come with the grommets for the studs. I had extras, so that wasn't a big deal. Fel-Pro is the one that has the extra holes for the later valve covers with 4 bolts. I wouldn't recommend using it.

Like Jon (and I) said, clean things up very well. RTV won't stick to old RTV and would likely interfere with the Permatex 300 as well.

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.