Gas for 13.8:1 compression?

How about straight from the horses mouth.

http://www.racegas.com/fuel/leaded
Sunoco HCR Plus 114, recommended for engines with compression ratios exceeding 14:1
Sunoco Supreme 112, good to 15:1
Sunoco Standard 110, good to 13:1

Fits exactly with Mrmopartech's suggestion. 112 will more than likely be what you end up running.

Remember, you only need what you need. More isn't always better. If 112 does it, 114 could mean a loss of money, power or no gains at all.