21 Stud 37mod

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Hey Guys

First I would like to say, what an awesome site with so much knowledge on these old engines. Way to to guys

I have got a 1937 221 Flathead that I bought from a guy that had salvaged it out of a quarrey in the mountains. I have no history on it but gave it a shot.
So far I have managed to figure out that it must be an UK built engine. It had a Lucas distributor and the amount of teeth on the ring gear and starter gear tells me it is not a US built engene. It has been bored 30 thou. over.
I have the block gutted and I'm getting ready to take it to the machine shop.
I have had a bit of problems finding main bearings and pistons for it.
The valve train seems to be easy to find. I will upgrade to the straight stem valves and adjustable lifters. The plan is to set it up with Sharp heads and a dual carb Sharp intake.
Not building a race engine. Just a mild street engine.
I have heard and read a lot on this Forum about the L100 cam. However I haven't been able to find out how I can get one!
So guys, where can I find main bearings, rod bearings, pistons and a L100 cam?

Any other pointers to aid me in the right direction is very much appreciated.

Eddie