Welcome Greg and I hope you've thawed out.
As Lightspeed says, there is an initial rev limiter set to 4,250 rpm for the first 2 hours of operation and then 5,125 rpm until the engine has run for 20 hours. After that the limit is 5,800 rpm. It's likely that the engine has already done the initial 2 hours during production so you should have the 5,125 limit for a while. When the ECU reaches 20 hours the limit goes up automatically.
ACF-50 is your friend for rust prevention, use it liberally!
For the "bafflectomy" there's info at
http://www.talkmorgan.com/ubbthreads.php/topics/422359/1 I've not done it myself but the advice is go very, very slow and use lube
