What kind of issues are you refering to? When turbos first came out (in the 1960's) on american cars, they were all draw thru. The main issue that draw thru turbo has, is the new(er) turbos do not have the proper shaft seal, to prevent oil from being drawn into the intake system, in non boosted conditions. My 170 turbo, draw thru, uses a modified Corvair turbo, which has the proper seal, as the Corvair was originally used with a Carter 1 bbl side draft car on the inlet of the turbo. I am using a 500 cfm Holley 2 bbl. on a 90 degree adapter. I did have problems with fuel puddling, at idle, in the adapter, untill I heated it with water.
PS: Do not use a intercooler with a draw thru setup. You don't want a intake "backfire" with a cooler filled with a combustable mixture of air/fuel. Can you say "BOMB".
