The crower I feel is closest to the comp XE274 would likely be their #60210 278HDP "hi-draulic hauler" it specs at:
rated dur. 278/288 , dur. @ .050 229/239 , lift @ 1.5 .480"/.501 , LSA 108
This is the cam I will be using in the 455 going into my '72 firebird,in a 455 its pretty liveable,but may be a little more "stiff" than most would like in a 400 due to the tighter LSA,but I would still have considered it if mine were a 400.
I have a friend with the comparable ultra-dyne grind on a 110 LSA in his 400 in his '77 grand-prix (mildly ported 6x4's milled .045) and it'll tear your head off for sure,it should be good for some mid 13's in that heavy car,but also you need to consider it has a 2400-2600 convertor and 3.90 gears though,as well as a torker I,and a 750 cfm demon carb.
He's dealing with the vacuum issue though,and will likely be addressing that soon but it can still be street driven,just gets a little "hard pedal" brake wise at stop lights.
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