"comes on to boost as quickly as possible and have solid power right till I hit the rev limiter" - am not sure an 18RG will do this for you without spending a container-load of cash on it.
Your five-speed (which is probably a W50?) will not last long at all doing this.
Without some form of timing retard, you won't be able to run high levels of boost. The MSD is only part of the solution.
Reliable high levels of boost do not come from randomly bolting on bits. You would be safer starting out low boost and working out how to make the motor handle increasingly higher levels of boost.
To do 18RG, you're better off starting out with a complete engine. There are so many things to change (head, timing gear, dizzi, etc) on the 18RC engine that rebuilding an existing 18RG will be easier.
How to stuff 30psi into an 18RG: http://www.toymods.org.au/forums/showthread.php?t=45130
Also, talk to NME308 about old-school blow-thru setups.
Personally, I'd go EFI with sensible boost levels and a W55/57/58 gearbox for starters.
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