Well the car has to run in the 11's before it needs a bar
hehe
Per the recommendations of Bill at Champion to me, stay with a straight up pattern. 206/206, 212/21, 218/218 etc...
212/212 did me good on my last TTA. Next time, 212/212 roller
Whats wrong with a walbro 340?
Lastly.. no o-ring with GM gaskets.. one or the other.