what can i expect from a 1904cc engine in my bus??

Im buying a new bus soon, it has a 1904 with a rebuilt box with higher 4th gear.

what sort of mileage /performance should i get from it, any improvement i should do?

engine spec from previous owner-

The engine was built by Audirac/Headflowmasters. New case with full flow oiling, 1904cc=90.5x74, equipted with Gene Berg blueprinted oil
pump with pressure relief and filter, the crank is from DMS and the Berg pully acts as a harmonic dampener, forged H-beam rods from CB Performance, exhaust is Kymco with performance
heater boxes, carbs are Weber IDF 40mm cam used is an Engle 100,mild perf. Gene Berg sump . the fan is a welded/balanced Berg fan and it has his oil cooler mod using the larger type 4 oil cooler. The rod length is 5.4 this was done so that with the longer stroke, rod ratio would remain close to stock for less piston wear. Has Pertronix ingnition and a

pic of engine-