Installed carb and have it running pretty good but when i punch the gas it doesnt return the throttle back downn to idle. Do i need a stronger return spring and where can i find one at.

 

you might, I did with my 32/36. But also make sure the cable is not getting bound up in on the linkage. ie jumping track. If so then the cable is either too tight or the bracket on the valve cover is bent a little.

The springs you can get at any auto parts store. It's up to you to figure out where you want to mount the spring. This will determine how long the spring you will need etc etc. Don't get too thick of one though as your throttle will become very stiff. When I did mine I wired the spring under the linkage and then to near the vacuum line assembly by the valve cover.