I have a F150 7700 4x4 with the 5.4 liter engine and lately it is not starting very well, any ideas what would be causing this or what I could do to help fix it? Thanks in advance!

Alright my dad has a 65 tbird landua he is doing a sort of factory restoration on. Goin to be a weekend driver and parking lot car show car. but nothing special. cars got good bones and is numbers matching. In a hunt for parts i have come accross several 65s. so im thinking of buying one also...