Rear gear recommendation for highway.....

Thanks for the advice. You are very knowledgable and I appreciate getting to know you, it must have taken years to get this into your head. I'm starting to do my own work later in life 72. Don't have a long time left but want to have fun for the rest. Hoping for 13s sometime then maybe better. My 340 has edlebrock heads a rumpity cam. Sounds good but the overdrive trans (I think) kind of messes it up.