no more than a 4.15 kit. Notch the bottom of each cylinder , and take a little off the oil pickup tube boss. Very easy to do.
The 440Source stuff is GREAT. I use a bunch of their parts including the 4.15 kit.
Their parts have a great rep so far - Ive been watching them since around 02 or so.
When i had my block machined, i had the machinist look over the kit . Everything looked excellent in quality , he just had to hone the rods for the pins a little .
My buddy has their stroker kit as well, his cuda goes 9.20's with Eddy heads and a 620 solid cam (went 9.12 with a new roller .620) , 12.5:1 CR i think .