I'm the other way around, my daily driver is by vin number a GTS, original 340 (LS23P8) car but I bought it as shell with no driveline and practically had to dig it out of where it sat. All I had was a slant six at the time. Its been on the road for 6 years now with the slant and OD 833 and gone though 2 sets of tires because it's my only transportation and goes everywhere. The slant might become a temporary...permanent thing because it's been the most reliable car I've ever owned.