I have never personally believed the hype behind the split fire plugs. I have always had good luck with AC Delco's & NGK's, but you will get different opinions depending on individual previous experiences. I bought a 1993 K1500 and it had an MSD ignition on it. It didn't feel or perform any better than my other stock trucks. I removed it and it made absolutely no difference so I sold it. I think with an otherwise stock truck the factory ignition is very sufficient. There is a great tech section over on FullSizeChevy.Com just for the TBI motors. Those guys will be able to tell you what works and what doesn't. Good Luck!

1990 Chevrolet K1500 Silverado 8Cyl5.7L - Engine
2 bolt rear main block in place of a one peace rear main block in 90 K-1500 w/ 5 sp. manual trans ,clutch throw , T.B.I.s
I'm Trying to engine swap a 2 pc, rear in place of a 1 pc with a 5 sp. NV 3500(get rag)transmission.clutch to crank distinctions, and would like to maintain the stock tbi set up. int, and exh. manifolds hook ups bolt patterns on tbi heads compared to the early model heads, and other related swaps ,with . Any help would be appreciated