I need to get some feedback from individuals who have bought rebuilt shortblocks or longblocks from SGP, Z1motorsports, or Tis-da-life who has postesd longblocks for sale on tt.net. I would like to know how your experince was with the individuals concerning service and quality of product. Where the intrenals rebuilt to posted claims and what is the condition of the engine presently which you purchased from either of the above suppliers. I'm tying to figure out if it would better to buy a engine that is rebuilt from one of these guy or do the rebuild myself by buying needed parts. Your details and imput would be greatly appreciated, thanks.