I'm about to install new cast iron heads on my new short block 350. I've read that the threads on all head bolts should be treated with plumbers Teflon sealant, Permagasket, or aviation thread sealant. The postings that talk about using the Teflon sealant suggest applying it to the bottom of the bolt heads as well as the threads to provide proper lubrication for torqueing the bolts. So... the head bolts that I have on order from Summit - Chevrolet Performance Head Bolts - appear to have some sort of sealant already applied to the threads. Looking for suggestions here... should I remove that sealant, and apply Teflon sealant to the threads and bottom of the bolt heads, or...? Thanks!