Tom..the spintech mufflers are designed just for cars like you just described..the are very flat rectangular shape and flow great..check them out..i ran a set on a 89 10.5 car i had 4 year ago before selling the car to a guy from Norfolk VA....the car ran 5.20's at 3300 lbs with a big block thru these spin tech mufflers..the car was a corporate sponsored TEST SPEC car by Southside suspension and built by K-town performance in Tenneesee...
the spintech's work for flow and clearence
http://www.spintechmufflers.com/spin...ntechindex.asp
Brian