I remember when I was 15 and we brought home my 68 fastback (1985). It had been under an oak tree on blocks for about 12 years. I had to put my arm up into the vents and pull out the leaves, one handful at a time... I remember filling up a 35 gallon trash can with leaves from the cowl and the doors. Find a teenager with a small arm to help you! Maybe a large shop vac tube can be flexed up in there to help suck some of it out. Oh, also make sure that the drains (seen through the hood hinge openings) are open and flowing. That will help prevent overflow leaks (wet floors).