Buick race car IMSA GTP

[68 Skylark cust]

I found some picture of 85-86 Buick race car who raced in the IMSA series classe GTP

Any of you have more info on those car ?

1985 Charles Morgan / Bill Alsup's Len Immke Buick
http://img88.imageshack.us/img88/4563/1985rp39charlesmorganbillalsup.jpg

1985 Whitney Ganz / Ken Madren Marsh
http://img155.imageshack.us/img155/1912/1985whitneyganzkenmadrenmarch2.jpg

1986 Charles Morgan / Logan Blackburn Turbo 6 ?
http://img55.imageshack.us/img55/1347/1986charlesmorganloganblackbur.jpg