If im not mistaken i think a 4612 is a 69 340 auto carb. Thats just off the top of my head, i could be wrong. I have a fresh holley 3310 w secondary metering block kit jetted 71p 84s that id possably trade you. Manual choke at the moment but i have an auto choke assy. Weaker spring for bigger cam (less vacume) Have the original spring.