As lamin8r said, the L200 is the more common swap, but seeing as you've already used the L300, and it works, don't be distressed about it.
Is there anyone in your local hot-rodding fraternity that could give you help and advice?
Hot-rodders are (usually,) a pretty gregarious bunch, only too pleased to help out a fellow rodder.
Owing to the popularity of this particular setup, there's bound to be someone local who has either done it, or knows someone who has, and wouldn't mind you picking their brains.
Ask around!

Hope it works out for you!