I finally got my new vafpr installed on my tbi and it makes a h-ll of a differance when you are running a 383. it woke up burned tires and had no more valve noise due to running lean. I am very pleased. next step is vortec fuel pump. oh I have a 88 jimmy 383 with hyp tech flat tops hasting rings 97 roller cam and lifters vortec high volume oil pump I have posted on here several times about timing but it turned out to be way too lean. I am soooo happy to get this straightened out. thanks had to let everyone know.