Elka uses off the shelf valving and spring rates for a particular weight and riding style. Thats why you can buy them from many vendors and get them quick. Most people looking to get the most out of their shocks wind up sending their Elkas away to get revalved or resprung.
Coming off of 25 year old stock shocks they will feel great. But if you have been riding more modern atvs recently, you will be happier with a more custom and better set up shock for YOU.
Also be totally honest about your riding and abilities with your shock builder. Ive seen guys go for an A level MX setup who rarely get more than 6 ft of air... The result is harsh shocks for 95% of the riding they actually do.