Valve cover clearance? 454

[munice]

I was just looking around on the web at different styles of valvcovers and I was just wondering if anyone has had issues with clearance from the firewall? My engine is bone stock in the stock location and the truck is an 87 halfton, Ive got the 454 in the truck now with the stock short plain covers but i'd like to throw on some tall chrome ones such as these:

http://www.factoryperformanceparts.c.../category_id/3

just thought I should find out what to look for when i start hitting the swap meets this summer! thanks