It sounds like you have two problems. A cranking problem with the starter and a running problem once it's started. I've had both with my 49' that drove me nuts. The starter dragging were worn brushes. The loss of power, hard starting, and dying when you let the clutch out was a bad condenser that burned my points out. I got a mile down the road to take it to a car show and I barely made it back home. Also you took it out of storage, Any chance critters built a nest blocking your exhaust choking out the engine with back pressure? Just food for thought.....
