I ran an STR-15 with single 4bbl top back in the 1970s. I could never make it run as well as the TM-6 intake.

Hot Rod did an article on intakes for "B" engines. The STR-15 among them. You can see that info at the link below. (When you go to the link, it will open a popup window asking you to subscribe to HotRod - click that link, which will take you to another page but leave the original page open without the popup. Switch back to the original page to read the info). Its worth the read.

Mopar Intake Manifold Shootout, Part 2

they even gave flow numbers on the headw (Modern Cylinder Head CNC Edelbrock Performer RPM heads)
they used in the test....


68 RR 528" INDY MAXX 07 2500 CTD Southwest International Raceway - IHRA - Tucson, AZ