I am needing help with my enclosure design. So far I am at a dead stop with my port... I just dont know what to do.

I designed the box to utilize the wheelwells in my 99 Explorer to save some space

Info:
Alpine SWX1243 x2
RF T25001BD

2.3139ft^3 W/O sub and port displacement
2.1199ft^3 W/ sub W/O Port


Internal measurements^
Crappy paint outline... Anyways my port, from the information I gathered, is too small. Port velocity is kicking my *** on this one... Someone mind helping me out? From what I gathered, my square port needs to be much, much bigger...

Thanks
KC