Chris Blair,
I say just go for it!! Build or buy the car worry about it later
There are exemption forms in place....Otherwise how would every custom Hot Rod at car shows be registered when there a Fiberglass body or Custom Motorcycle for that matter.....you know them $200K Custom rods at cruise nights ? are they running a full cat back exhaust with Air bags and working wipers with reverse lights...Highly doubt it
I dont believe that buying a crusher with a 66 title works, I would think the RMV would be a little smarter then to let that slide by...I might be talking out my Butt
The registry at the time gave me an exemption form that also waives me of emissions every year so getting my yearly Sticker isnt an issue
Im speaking from experience and also a residence of Mass....My only doubt is that things might have changed and im Grandfathered into the old rules 0f "2006"