Searching for Horse Racing Statistics and Datasets

Hello!

I'm doing a research project for predictive modeling of horse races. I've found many sites for this but most seem to be spotty. I'm specifically looking for statistics regarding the Del Mar Race Track, Santia Anita Park or Los Alamitos (really any American track will hypothetically work, just want substiantial information) with as many statistics as possible.

Similarly I'm looking for extensive data base that includes simple things like placement of horses and what track along with aspects like horse weight, type of race, horse's trainer, horse's jockey, number of horses in said races, race distance, track conditions, weather etc.

Any help would be greatly appreciated!