I have a 1968 Ford Mustang with 96,000 miles. I have a 289 engine. I seem to have lost the valve keepers on the forward valve (intake?) over the #3 cyl. The top the valve stem is slightly hammered flat, but I want to replace the keepers to keep the car running until my rebuilt engine arrives. I have applied air pressure to the cyl. but it seems to blow out the intake manifold. Do I need to put the #3 at TDC to create air pressure? Why would the keepers just fall out? Is there anyway to easily replace the keepers,I'm having a hard time getting the second one in as the spring doesn't seem to compress straight down. THANKS