That old ball driver charger would come anywhere close to the need for 42lb/hr injectors, or a 340lph pump.....but they can be installed regarless.
I guess I'm one of the few that doesn't see an issue with the 190lph pump or the 24lb/hr injectors/FMU combination.
The pump itself has show to handle over 570hp N/A.....Even with 6-8psi on tap (which is really pushing it with this blower), so he should be well within safe limits. The Allen guys used to run 6-7psi all day with FMU, stock injectors and a 190lph pump. The 9psi kits would upgrade the injectors (probably cheaper than having kit specific FMU recalibrated), but still stuck with the 190lph pump.
My old Cougar made 410hp/456lbs/ft tq at the flywheel with the 190lph pump until in the tank until the guys of this forum scared me into upgrading....but it never fell off at any point on the dyno.
As for the FMU....the only issue I have with using one, is that they can't really be fine tuned for accuracy. You can certainly get them ballpark (
Vortech has many options for various injector sizes) but It'll never be as accurate as an ECU. So while you may have one set up to meet the max fuel delivery needs (read: safe levels), it may result in richer delivery in lower demand regions. Not to mention unable to compensate for elevation or temperature. The result....a fatter A/F ratio in order to keep things safe up to peak hp.
Nothing really wrong with that....simply not an "optimal" set up. Still an otherwise proven, low cost and most importantly safe alternative though.