Looks like I'm caught up in a fuel pump eccentric trap.
The Rollmaster timing set that I've bought (EC3010) looks to be for a one piece because the outer on a two piece fouls on the boss of the cam gear. Romac are now on hols, so can't seek advice from them.
Enquiries so far reveal that one pieces don't grow on trees. Eagles have one that's for a 7/16 bolt but my cam is 3/8 bolt.
Any advice on where else to look for a one piece eccentric?