ORIGINAL: coop-RCU

Hi Guys....I'm building another one of these kits, I've built a few of these cars before, I've always installed an OS-12 CV-X engine in them. I like the engine, seems to run very well and reliable, what I don't like is the head, I wonder if the engine runs cool enough with that square head. My question is, should I stay with this engine and get an aftermarket head like the O'Donnell, or what would you guys recommend as an alternative engine? .....Coop