ok guys I need your brains  again 
ive picked up a Cpl of engine, short blocks,   I just need  a case but im not sure which is the better for the build ?? one,s an AS41 code and the others a AS21 ,,,,, ive a 1774 in mind with a full balanced crank , conrods ,ect ,ect  ,with out look of turbo in it at a later date , but before I start down the path of a build im not sure which case would be better for this
any help will do 

I think the AS41 case is the one to go for. Should have dual relief valves in the base of the case. Don't know about the 21 case. 

  a 1776 ,, not a 1774 ,,lol 

Very little difference it is down to what they are made off the as21is more durable and less likely to crack problemfor vw was they cost more to produce
either type with twin relief valves willbe fine 1776  is minimal machining compared to 1835  and upwards where the case is weakened.

  cheers guys ,,im guna go for the AS41 ,,  as I stripped it last night it looked in good shape ,, crank is a good one , all std shells very clean inside ,,,, as the AS21 ,,, crank reground ,bearings dead  , and poss line bore  as ive placed the std shells in it and it feels sloppy ,,  so AS41 it is ,,,  ,, just one more thing the cylinder hole  ,, can any one tell me what the this is ???on my case it 90 mm across is this std 

 standard vw size for 1600

Thanks snoopy ,, now my work begins