I'm impressed at anyone who's able to drop a K-Frame in 1 hour. My mechanic Paul who is building these Jseries monsters is only able to drop the K-Frame in about 1.2 hours or so.....
Please double check and triple check your information on the boring information. When you bore it to a 3.6, you still have enough tolerance to boost up to 15psi. When you bore up to 3.7, you will not be able to safely boost unless you get it resleeved from darton ($1000) then you can get up to 30PSI
Properly built Jseries engine will be lighter because of the forged components it will be using. Such as the crank, forged pistons and rods etc.
Of course a stock one will not make much of a difference, but then again, the weight savings from AT to MT is HUGE!
Read here and get educated plz
http://www.v6performance.net/forums/showthread.php?t=191426&highlight=3.7
http://www.v6performance.net/forums/showthread.php?t=162630&highlight=3.7
http://www.v6performance.net/forums/showthread.php?t=90285&highlight=3.7
http://www.v6performance.net/forums/showthread.php?t=169002&highlight=3.7
And yes... I know the builder in person, and my build is coming along nicely

a J36