thanks for the info will be using it to test in a couple days when it warms up

 

this 4.3 tbi has two metal lines that goes to the back of the fi one is a little larger than the other, is one a feed and the other a return is that what that is about, would it be safe to assume that the smaller is the feed, it is on the left side at back looking from the front of the truck backward, if someone would help me understand this, thanks

 

the larger would be supply the other return. from memory the supply should be on the drivers side.

 

thanks for the response, I have decided to convert the 4.3 to a 2100 carb with hei vaccum advance distributor, I dont think i will be happy until i do, I'm old school, I just finished installing new window and door rubber seals, I actually wanted to do an engine swap to a small black chevy v8 and auto transmission but after I found out that I could convert this one I decided to give it a try, I want to thank everyone who took the time and responded to my request for help.