you got to pay to play man...half assing it now will only lead to permature failure down the road and that is the last thing you want to fail...rebuilding that engine will cost way more then replacing the tensioners and pullys...
The photo looks like the pullys are very similar to the drysump cogged belts on a formula ford/formula 1500 you may want to look at pegasus racing http://www.pegasusautoracing.com/ those guys have everything
Thanks you all ,
here attached is a better drawing i took from the pulleys.
I think it's a standard HTD profile and discovered it was designed by GoodYear in 1976.
I am wayting for an answer from Gates they are very nice and competent !
I think i will install PowerGrip GT2 960-8MGT-30 or may be better matching PowerGrip HTD 960-8M-30 industrial products. They should be rated for 20000 rpm. Any draw back ?