Gronk's mc2100 two barrel mod
Gronk Performance is selling a two barrel Mastercraft 2100 conversion for the 6-230, and lucky me, I live about 40 minutes from Gronk, so I bought one ($315 delivered) and he came over and put it on for me last weekend ($100). Gronk is awesome, and the carb made my 230 come alive. I am very happy so far, as the truck came from Iowa, and jetted for that elevation, and I am here in Colorado Springs, so upgrading from the 1920 to the 2100, and jetting properly obviously helped!
You can find this mod on ebay here, and Gronk was great to work with. After I get my windshield back from my glass guy, I will be driving it more, and will report back to you all here.
Update: So I wanted to engine to look stock even though I have a MC2100 carb. The air cleaner needs modification to fit on top of the new two barrel carb. Lucky for us, the indentation on the bottom of the stock air cleaner is just a little larger than 5 1/8", so you can take a jigsaw with a metal cutting blade and zip out that center part, leaving a little lip, and then RTV in the 5 1/8" ring for the new carb (stolen from a cheapie Spectre air cleaner). Drill a hole in the lid (spin it to find dead center, mark with sharpie), and with the exception of a wing nut on the top of the lid it looks stock and hides the two barrel carb. Pretty cool. Now I have to find a crankcase breather filter and a union so that the crankcase and the fuel line breather can get clean air, but everything else plugs up as it did before.