My first top (bought base only for $100!) was a dual 390 setup off a 1/4 plate. It lasted about 3 minutes before a pop buckled the edge and vented it. 2nd was a 3/8 plate with a single Demon 650 that lasted forever, too bad the carb was ****. Ran great if you could keep the needle seat clear. If I were to do it again, I would tap 2 1" core plugs in the China walls that would blow before the top would buckle.
