Thanks for everyone's feedback. I don't want to use the 70 C4 so based on the feedback I am going to:
1) Pull the 1966 engine/trans (validate it's still a 66 engine)
2) Use my rebuilt 66c4 "body" and new torque converter
3) But use the 70 250 bellhousing, flexplate, and 70 starter so it bolts up to my 1970 250 replacement engine.
4) Will make sure the depth of the 66 and 70 bellhousing are the same so there aren't any issues with spacing.
5) Will check the input shaft and hope it's the same length, size and splines.
In the scenario about just wondering if I can also use the 66 flex plate and then what starter would I need to use? Does that sound reasonable, or did I miss anything?
1) Pull the 1966 engine/trans (validate it's still a 66 engine)
2) Use my rebuilt 66c4 "body" and new torque converter
3) But use the 70 250 bellhousing, flexplate, and 70 starter so it bolts up to my 1970 250 replacement engine.
4) Will make sure the depth of the 66 and 70 bellhousing are the same so there aren't any issues with spacing.
5) Will check the input shaft and hope it's the same length, size and splines.
In the scenario about just wondering if I can also use the 66 flex plate and then what starter would I need to use? Does that sound reasonable, or did I miss anything?