So $650 is the budget? You can get a TFS Street Heat for $400, a Track Heat for $450, and an Edelbrock for $550. These are ballpark numbers of course. The Holley Systemax II is around $600.
Or you can use the Holley Systemax I, it's a direct replacement lower that reuses the upper and is great for the sleeper effect.
Or you can use the Holley Systemax I, it's a direct replacement lower that reuses the upper and is great for the sleeper effect.