Welcome Aboard! Would love to see some pics over your little street rod NL 320.
I'm sure if post a list of some specific parts and trims needs some 320 Enthusiasts will contact you through NiCo's 320 Forum. There are quite a few of us that have more than, like 4 or 5, and might be able to help. In the mean time check eBay regularly and you might contact neonman52
as he/she or LLC seems to be selling some hard to obtain parts from a '64 320.
Here's a link to one of their items-
http://www.ebay.com/itm/1963-1964-1965- ... 1e&vxp=mtr
I'm sure you are aware that the NL and L are a little different when it come to body panels and trim from the front windscreen back. An alternative to the trim and mounting hardware is to look at MGB, MGB-GT and '60s MK II and MK III Midgets for their chrome side trim. Sorry do not know the exact measurement of the front fender, door, or rear quarter panel pieces, but I'm sure someone at Moss Motors, Victoria British, or warm beer BMC forum can square you away.