So I scrapped my L98 SD setup I was gonna go with after I read a recent thread about this swap with the L31 carbed. Gonna be picking up a L31 tomorrow out of a 99 truck. Got a few questions. This is gonna be going into my 92 rs conv which had a TBI 5.0. Can I use the stock fuel pump in there now? Also I don't know anything about carbs so is there a carb I can buy which is plug and play without much tinkering with it? What would you guys recommend? Also what kind of dizzy do I need. Would be great to get some part numbers. Thanks .

 

Why not stay withTBI. If you upgrade it I think you would be better off.

 

Don’t you have to stay emissions legal ?

 

Yeah that's why ill keep my stock TBI setup for passing smog. I just need a carb that is plug and play if there's a such thing or one that i don't have to tinker with much. Everything else is pretty easy

 

You will need to tune a carb. No off the shelf is tuned to a specific engine.
If your going to switch back to tbi to pass emissions it too will need to be tuned. You can datalog and provide this to a tuner so changes can be made to fueling. If your going to use a 4 barrel intake and a adapter for tbi you might have to get a cowl hood so it fits.

 

Probably won't need to swap back to TBI for emissions testing, I know some people. But If for any reason I have to, I have my 305 TBI block ready to go. I'm looking at buying the edelbrock 600 cfm1406. Seems like a good start.

 

I use the Edelbrock 1406, 600cfm carb on my L31. I've never tuned it. Had it for 4 years now and the plugs have always looked dead on. I just drove it on a 1,300 mile highway trip and got 18 mpg. As for the dizzy, I use an Ebay new $50 one for the last 7 years.