Is the 305 you are refering to a sbc? If so you should have no problem because apparently someone has made a changeover. As for the th400 it is not a direct bolt in from a th350 / PG, the th400 requires a different crossmember. A trick to overcome the crossmember problem is to take the th350 crossmember cut the mounting tab off the front and reweld it to the rear side of the crossmember, or move it rearward and drill new holes in the subframe. Firebirds, and Camaro's share the exact same unibody in all respects therefore you just have to crossover the parts and part numbers accordingly you may have to drill an extra hole or two. Good luck.
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