Waste of money, especially to try and get less than 100HP.  Blowers are a great power adder, but you want to be able to add minimum 100HP.  On a typical stock rebuild engine that has cast or hypereutectic pistons this is a good way to destroy an engine because without forged pistons you are asking for problems, especially with a carb.

All I see in the eBay listings are blowers.  There are a ton of other parts you would need to make those work.  The centrifugal blowers require a pressure box where the carb is installed, and a special carb that can operate inside a pressurized environment.  Any kind of blower will require some way to retard timing to avoid detonation.  You need a blow off valve to avoid damaging things when you let off the throttle.  The centrifugal blowers work best with an intercooler, or they can have a lot of lag.  I would avoid a used blower as well. I'm also cautious of prices on parts that are too good to be true, because eBay has a lot of Chinese knockoff stuff sold as genuine.  I think you'll have $2,000-$2,500 into a blower setup by the time you get all the parts and to spend that and make say 50-75 more HP because the engine can't take more is a waste of money. 

I would put my money into a good set of heads and a roller valvetrain (cam, lifters, rockers).  Select the heads right and you can transfer them over to a larger engine at some point when you have more money.  You'll spend probably $2,000, but you'll make another 75HP or more reliably, and have a setup you can use on a larger engine later for even more power. 

thanks tko and bob e , it's always a pleasure learn from experts ! This will save me from wasting money !
Was too gold to be true !   i will looking for roller valvetrain and heads ! thanks Soo much !

My advice on heads would be either Edelbrocks or, if you can afford them, AFRs.  Then get a recommendation from Crane, Comp, or one of the cam companies as to which roller cam to run based on your combination.  You'll need conversion roller lifters with link bars.  I would advise running a 1.6:1 roller rocker (stock ratio), as the 1.7s just put additional stress on the valvetrain and since you're getting a cam anyway you can have the little extra you'd get from the 1.7s ground into the cam instead.  I like the Crane Energizer rockers.  Harland Sharp also makes a good product.

Now all you need is for me to pack them in a cookie tin for you and mark the package as a Christmas gift to avoid the import duty, right?