About to build my second one of these. The first had the Century Retracts and they were great. Just ordered the second set. Part number 31899. $255.
Also, I am going to upgrade and go with a Mark 1.80 gasser from Morris Hobbies driving a 3-bladed prop.
Sold my last GSP Spit to a local guy and wish I had kept it. Very nice plane. Tried to get it back but he wanted to keep it. Last one had a YS1.20 in it which was plenty, but I am done with glow.