Not sure if you’ve researched all the details of such a swap. Here’s some comments on doing this in an 1800. What year of amazon ? Earlier models up to 67 IIRC, the transmission tunnel is too narrow, unless it was originally an Automatic trans.
https://forums.swedespeed.com/showth...ghlight=T5+b20
And an Amazon.
http://forums.turbobricks.com/showth...ight=T5+Amazon