I never heard of Martin's. Although I don't know a welder now, I may get to know one. (Six months ago I didn't know anyone who could machine alloy wheels like my BBS's but necessity forced me into action.)
I'm still a bit away from drivetrain improvements. When I get closer, I will revisit this post and ask a few more questions. I'm assuming a 2270 will be in the 125-150 hp and ft-lbs range. (I don't know how the latter translates in terms of Nm.)
You also mentioned Berg. Do you thing their 5-speed is up to snuff with my probable engine?
Thanks for good information.