Big Block ?

Yep. I haven't built my headers yet, but that will be later this year. I'm currently removing the rear shock crossmember for installation of an upper coil over shock mount. I'll try to get some updated pictures when I get back home from this trip.

If I understand it correctly, the 383 and 440 are the same block so I could expect to run into the same problems you're facing if I wanted to put a 383 in my '65 Barracuda, correct?