There were many cars parked in front of the store just now.
「さっきけっこう車停まってたよね」は英語ではこのようです。
There were many cars parked just now.
さっき結構車が停まってたね。
There were many cars in the parking lot just now.
さっき駐車場に結構車が停まっていたね。
There were many cars parked in front of the store just now.
さっき店の前に結構車が停まっていたね。
There were many cars outside.
外に結構車がいっぱいあったね。
ご参考までに。