My Kids 70 Duster we used Schumacher at 1st , never did anything other than test fit and mock up the headers.....in the end we used a motor plate.....I know that doesn't help you but FWIW the engine sat in the same spot as the 340 we pulled out of there, with the 904 bolted up the trans mount was in the correct spot.

1963 Thunderbolt 496FE 10.80 (still a work in progress)
1968 Mustang slow a$$ 428 FE
1971 Boss 351 Mustang 11.20@115mph
1993 Lightning 10.61 @ 129mph 408Ci A3 headed NA
1996 Viper GTS
2001 Lightning 8.99 @ 155MPH 5.4 Mod Motor
2009 Ram 9.65@144MPH 463CI G3 NA
2010 Challenger 9.91 @ 139MPH 408CI G3ci NA
2019 F150 (local dealer's Lightning package) ..11.90s