engine dynos can be all over the place just like wheel dynos. the same engine will show different numbers on different dynos, lots of variables will determine the final numbers.
the numbers do seem low for that cam & heads. just as an example my 467 with stock 72cc round port E heads, 10:7, OF 236/242 cam with a ported HO intake & q-jet made ~520 hp with a fuel pump that was inadequite, & just under 580tq. a known strict dyno with no tuning to the engine, just bolted on the parts & did a few pulls while breaking it in & checking for leaks.
seems like your engine with those specs should be making a lot more hp/tq, even with a 750 carb. im sure the EFI will help, but testing the car on the track will be the best way to show the ability of the car/engine.
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