Mike, not so oddly enough I happen to have a 305 center bolt rocker covers, one piece rear main seal, c/w with ring gear, balancer, 4 barrel manifold, sitting on an engine dolly in my shop/garage/???. Along with it's matching TH200R4 It became a refugee when i yanked them out of my Monte S/S project; ran when pulled, has sat for a while; short back story is that the mill did not match the car, I wanted a year correct engine for my project and found one. Best of my recollection, admittedly short, it did not huff or puff when I snatched it out. No carb or timer, they got shelved for use on the replacement. Currently sitting on an engine dolly and covered up. This assembly, motor and slushbox, is free to a good home. If you are considering your options for a replacement power train and want to keep the Lady Mullet on the road while assembling the bits and pieces..................it just depends on what you finally decide to run with.
Nick