Hooker headers with Milodon 8ct pan
TTI and I'm pretty sure Dougs fit small blocks with Milodon 8 qt. pans. There is suppose to be a Hooker may fit also but don't know which the part #. Milodon also has a similar 7 qt. pan but you'll have to contact Milodon or ask around. TTI's have the #& pipe separate because it goes out and around the frame and slips into the collector.
Did you install the 8 qt. with the engine in or out of the car? Usually you'll need to cut a little "V" out of the k-frame lip so the right-front corner of the pan clears it during R&R of the engine.