65 won't start

[Anti-Ricer]

I know this is a LONG SHOT but I was installing a radio yesterday which I got it in and working.they are wires hanging everywhere like a big ol rat nest of wire.Anyways I tried to start it up today and nothing.all you hear is the electric fuel pump kick on.it use to stsrt like a new car you could barely turn it and it would come on.Im checked the wires and fuses and got no where.so here's the million dollar question. does anyone know what possibly could be going on or give me some ideas as to what it could be maybe something I can try? thanks for any help
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