I would like to thank all the guys here for helping me build me 350 TBI engine
I had the same problem with you
and it's comp cams fult
I have set the timing on 0 and when I try to crank the engine it's backfire from the throttle.....I thought it's need a spcial degee or something.....but it's won't start
finally I after 2 weeks of trying I found the problem...it's the comp cams timing gear #2100
it's give you a totally diffrent degree of the 350 engine
usually when you matching the two points on the timing gear the piston #1 must be on TDC "new lesson to me
" but with comp cams when you matching the points the piston #1 is going down with open intake ..or intake stroke and that's why it's back fire when you try to crank the engine
comp cams is junk is poeple say and now I belive they are junk
it wasting me the money-time-work so you should match the old parts with the new
see the diffrent between the comp cams gears"left" and other brand with a correct timing "right"
I try the free host but won't work...so I upload the picture in my flickr account
comp4re | Flickr - Photo Sharing!
good luck and contact the comp cams....I think they replace it ...I,m not yet contact comp cams yet