1972 340 4 spd Demon GA4 (sizzler ?)

Hey everyone, back on the site again now that I have another A body. Picked up this 72 Demon a while back. No build sheet or anything. I’m trying to find out as much as I can about the car. So far I found out it’s a GA4 paint code. It’s an H code car so 340. Has a Hurst shifter. I’ve been told it’s possibly a 72 sizzler. I’m doing some research on these and it looks like from what I read the only engine options for the 72 sizzler was the slant six and the 318. If anyone has any input or information I would appreciate it.