That's a sweet 273. Is that the T3 Isky, is sounds great. I have to get serious about my 273. Looks like you do have a little beast there. Great job :)
Yes , this is the Isky custom grind t-3 solid cam. here are the specs .
455 lift 260 duration advertised [email protected] , 108 lsa with 2* built in , 2000-6400 , lash .018 hot - .020 cold , my vacumn is 15-16 @ idle . Idles @ 800 rpms. it's just a tad bit larger than the e-3. call Ron @ Isky for more info if interested.