440 in my 70 swinger???
Your were asking about 383 or 440.
I would go with a 400 stroker.
Use the Schumacher headers and mounts.
I would also use the 73 and up k-frame.
Here are 2 cars built diff.
74 duster 11.70's car
440 Schu's headers.
Plug changing is a snap.
67 Dart.
runs 10.70's
tti's
Plug changing is a *****.
If you are building a car that's not going faster than 11 flat.
I would go with the Schumacher headers.