Excessively large tanks frequently are the cause of running problem for lots of fellows and generally a bad idea. Yes it can work if you set everything up perfect but more often than not I see folks complicate poor installation problems with oversize tanks and the result is often flameouts and never really being able to uitilize the full capacity anyway.

A substancially larger tank than the norm for any give displacement will experiance a greater fuel head pressure variance from full to empty and the engine will spent more time with weak fuel delivery problems than neccessary.

John