I will pick up a 454 big block eventually.But be warned,I've heard they are a PITA to build because of the negative ring around the base.I really like the drip tips that come with them,they are made to cut out spit back.
http://s95.photobucket.com/user/shepelwich29/media/Mobile%20Uploads/20150208_000732_zpslrw1kpj4.mp4.htmlHere's a video of my little cloud.40pg/60vg PBFB from Fadora Vapor. 0.4ohm dual micro coils
Its probably burning your throat because of your juice ratio,a thinner viscosity will wick and burn up faster than a higher VG juice will.I would try a 50/50 if I were you.