So I'm looking at buying a Revo 3.3 roller.

I want to put in a big block I had an OS .21 in a T-maxx pretty much a direct replacment.

I've read so many threads but I havn't got a clear head on the conversion.

How much is involved into getting an OS.28 into a Revo? motor mount, exhaust, clutch???

Or does it require many modifications the extra power from a .28 is not worth the direct drop in of the .21, or is the .21 even a direct drop in on the Revo??

Thanks for any help.