Hi Brando, and welcome to ProCooling.
A good starting place would be:
WWW.dtekcustoms.safeshopper.com
This site has a good selection. The TC-4 poly toped block is a good one. They have heater core rads with shrouds that will save you money compared to the "made for watercooling rads" and perform better. The Eheim 1250 is a good pump to go with the core rad & TC-4 block.
Useing hose clamps on all connections will offer peace of mind.
That glow you like is caused by UV dye that can be ordered at D-tek in several colors.
In the liquid and phase forum here is a search engine just for heater cores if you'd like to save money by making your own shroud. Just type in the size of core you have room for and it will give options.
And again welcome to ProCooling
