Which Crate Engine?

Ok its down to two for now, which one should I get?

Smeding 383 Extreme with upgraded heads and carb.
Head will be AFR 195 with a Holley 750.
480 hp and torque.

http://www.smedingperformance.com/383extreme.htm

Price 6665 Shipped

Or MAS Performane 490 HP 383

http://www.masperformance.com/490_383.htm

Price 6600 Shipped

Thanks,
Rodzilla

They both seem a little cheap for what they are advertising... They both use hyperutecnic pistons (fancy word for hi-silicone cast) which I don't like.
I dunno... makes me wonder about the quality of the machine work