Bah! I literally just bought a 300M input shaft an hour ago because I couldn't find any 4340s or anything that is better than stock (300M will be overkill for my goals). You have any 7\8" gear sets or anything?
Nope, no sprockets.....cancel your order since the guy or company hasn't shipped it yet and then buy the 4340.
1999 GTP 2dr - Whipple 537whp.....for now
1998 GTP 4dr - ST2, Cartuning PT61, IC - SOLD
1999 GTP 2dr - SIX, GenV, Headers, TEP Trans, E85 - SOLD
1997 GTP 4dr - 3.4, 1.9's, 3" DP, P-log - SOLD