Tyler, looks like you have a 64 B40F, this was the first upgrade with sidepoints, uprated gearbox but retaining the bush timing side main bearing. To check conclusively look at the timing side crankcase just behind the barrel, there will be a small circular cover marking where the distributor was on the pre F's. The sump plate will be oblong not square. If the circular cover is not there and the sump plate is square then you have the 65 B40G, this has all the F's upgrades plus further improved gearbox and a ball bearing on the crank timing side.

EY identifies it as being first registered in Bangor Northern Ireland, guessing at the full reg is EYP 20 B or EYB 20 C, neither is showing online at the UK registration website so its been off the road for some years.