I just spoke to my engine builder, he said he has had a bit to do with alot of the rolla engines building them for rallies et.c, and mine, i asked him about getting springs, rods and work on the head, he said he's got plenty of suppliers in queensland he can easily get his hands on the gear for you. If you want to know more give me a PM or you can call him yourself
Mick
Free Flow Cylinder Heads & Engines
(07) 3245 5044
I find if you want to know about building a engine talk to the guys who do all day everyday