I have seen a few of these done around here & it's not a particularly difficult conversion, however, .......... you will have no ported vacuum for the distributor, so in highway cruise mode, you will be effectively running timing that is retarded from the optimal position.
Desirably you will interconnect the four runners with a smallish tube that runs parallel with the crank with a fitting for the PCV valve. The idea is to share the crankcase fumes between all the cylinders & this way you will have some vacuum to make it work.

If possible, hook up a fuel pressure guage to the fuel line for test purposes. When Aidens first engine was built it was found to run lean at full throttle & this was in part because the fuel being sucked in was more than the pump could maintain. When a second fuel delivery line, with a second pump was added, the pressure was maintained & things improved. A little jet drilling fixed the remainder of the problem.

So there you have it
PVC
Fuel pressure
Jet size
No ported vacuum.