AND Actually it is hard to tell - you have not given us enough specific information. That could be because you do not yet have a clearly written, specific estimate, for the work proposed. All manor of numbers can be and usually are thrown around when guys at the "shop" are just talking, or trying to give answers off the top of their heads.... usually that is worthless data. First place to start is to ask the shop or shops you are considering to give you a written estimate, that shows clearly and in detail all labor costs (not just a total), and the specific parts as well as machine shop charges expected. That shouldn't be too hard from them to do, if they have much experience with the L Series engines. If your shop said "top to bottom" - - does that price include six new pistons, a new cam and all new rockers, retainers. Does it include 12 new valves & seats? Does it include having the machine shop hot tank, bore and deck the block? Are the crank and rods going to be shot peened and magnifluxed? Actually it's easy to "spend" $5,500.00 rebuilding an engine. The question is - "is it necessary for your purposes?" It is also easy to make more "profit" on a job that the customer pays $3,500.00 for - if all that is included in the "rebuilt" is rings/bearings and fresh valve job. Not to mention - answering the question of who is going to pull and reinstall the engine in the car. Then there is this thing called "schedule". I've seen cars in the shop, work completed and the customer drives out happy in two weeks - - I've seen others that took four months to six months. Shops that underbid the work, get into the engine and then have no real motivation to finish it.... so it gets constantly put behind more profitable work... while they blame the machine shop for the hold-up. All the advice so far has merit - but I really think your starting point has to be to establish a very specific baseline - - and that means getting detailed and clearly written estimates from any shop. The estimate has to include a completion date or specific number of weeks it will take, with associated discounts when it isn't completed on time. Last thought - I agree that if you want performance - swap the SU's onto a rebuilt L28... The advantage there also includes a quick turn-around. After the L28 is rebuilt and ready to go - you'd only be in the shop for a day - - then out driving again... FWIW, Carl B.