Thanks for that trackmr2 I'll give those guys a call
I'd be reusing my 3s block and machining the 5s crankshaft to accept the rods, am not aiming for massive HP so the 3s block will be fine. It will predominantly be a street car with occasional track use, so driveability is a priority over peak hp. At the moment I'm thinking a gtx3071 with 0.64 a/r although it may be a bit overkill for the street, still a bit indecisive on that.
The other option is just stay with a 2L build paired with 264 cams and a gtx2867, that should get me a reliable 220rwkw which should still be quite quick, only thing is if I'm sinking a reasonable sum into it I don't want to regret not going bigger to start with!