I was talking to a Ford mechanic (that's all he works on) about haveing problems locating items required to modify my truck (87'/5L) from EFI/MAP to SFI/MAF. He said "Be careful what I wish for!" Mentioning "Pandora's Box" & "Worms in large containers". He said he's done 2. His own vehicle, and a customers, but never again. He said the best bang for my buck (based on my existing minor mods) would be an MSD ignition box, which would extend to spark duration of each firing (more like a double tap) & leave me with the free time I've come to know and love. Anybody familiar w/these?