A 6-AL will do you fine.
This may be a reach, but you say your home track is Alamo City Motorplex. If I remember a previous conversation I had with an old fiend Joey Lapelle (who was the technical director of MSD), well I understand he is now working at that track. You would be wise to look him up.
Last time I saw him he was out here for the Winternationals with a guy running in Top Dragster by the name of Lyle Bynum.