Is it necessary to remove the old carpet glue before installing new carpet?

This s*** is on there good if I do need to remove it what is the best method?

I have plenty of grinding wheels and respirators i also have a badass sander.

Here's some pics

Hey fellas I have a 17 ft 1979  tahitti  hull  with  a  jicuzzi  jet  bolted  to  the   back.  The hull is in great shape and I I have a freshly rebuilt 454 ready to drop in.  I have a few questions:
1.   Will any ol' bbc marine bellhousing bolt up to my jet? Or does it have to be made for the jucuzzi?

2.   Are these jets any good?

3.   Where can I find a bellhousing at a cheap price?

4.   Where can i find a driveshaft at a good price?

5.   Is the bellhousing the same for a 454 and a 350?

Sorry for the noob questions i just dont want to buy parts ant have ti bring them back.
I am an avid engine builder but new to the jet boat world, so i dont have any connections yet.
Thanks for any replys fellas.