I notice in the pictures that you have the rocker boxes fitted with the oil feed on the left hand side.
As standard, Triumphs always had the feed on the right hand side.
Under normal circumstances, it does no matter at all. But, it made me wonder, have you inadvertently fitted the inlet rocker's, complete with the offset buttons (giving greater lift) in the exhaust side?!?
Pre-unit Tritons have a bit of history which almost makes them authentic as an historic bike. But in actual fact a pre-unit Triton can never handle as good as a genuine Manx. And a Triton with a unit motor is hopeless at speed in any bend. The weight distribution is ridiculous and the gap behind the gearbox is horrible. The theory was 'a good motor in the best frame' - good in theory, but not in practice. In a road race, a genuine 500cc Manx with usually trounce any 650cc Triton. I have raced a Triton against 1963 Bonnevilles - they were a much better bike than a Triton. One of those, done properly is a real gem.