@JKCuda
Do you have the old latch assembly? The new one that you have looks to be a bit different than mine, I have a 73. Have you tried to put the spare striker into the latch to see if it will latch all the way? Is the front portion of the latch, where the spring is mounted, to high so that the striker will not go all the way down to allow the latch to fully close?
Also, like Challenger RTA asked about door gap, if your fenders and hood are back, towards the doors and cowl, the striker on the hood will be back which will put it forward in the latch, like you have. That will be a bit of work to adjust the whole front end sheetmetal but that may be the correct fix.
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