Engine Swap Help on Manco

[sschupan]

New to the forum and could use some advice.

Just bought a manco 706 2 seater. It had a 212 engine on it and being a 400# kart it was struggling with me and my son going up hills. Last night the hackjob the previous owner did on the engine mount broke and did some havoc. Good news is now I have a excuse to upgrade it how I want. I want to put the 420 engine in it but my lack of experience is which torq converter, chain, sprocket I want or need? Any help would be appreciated. We have hilly property if that makes a difference. This manco has the hex live axle on it. Thank you in advance!